en.Wedoany.com Reported - German energy company EnBW has initiated the construction of a large-scale battery storage system with a capacity of 100 MWh at its Marbach power plant site, scheduled to be operational by the end of 2026. The system will be connected to the transmission grid managed by TransnetBW and aims to provide short-term regulation of fluctuations from wind and solar power generation, matching electricity demand.
As part of the transition to sustainable infrastructure, EnBW is expanding its battery storage technology to complement renewable energy power plants and flexible generation capacity. This move aims to alleviate power system instability introduced by wind and solar energy, ensuring smooth grid operation. Peter Heydecker, a member of EnBW's Board of Management for Sustainable Generation Infrastructure, stated: "Large-scale battery storage systems are indispensable for the short-term balancing of fluctuating generation from wind and solar with actual electricity demand. For longer periods, hydrogen-ready gas-fired power plants can take over. Therefore, these two technologies ideally complement each other." He added: "By connecting to TransnetBW's transmission grid, this storage facility will play a significant role across the entire southern German grid."
Mayor of Marbach, Jan Trost, expressed support for the project, noting: "By building the battery storage system, Marbach's position as an important energy location will be further strengthened. We are pleased to contribute to the region's supply security." Construction will begin with ground treatment using the vibro-compaction method to enhance the foundation's load-bearing capacity, followed by the installation of approximately 264 battery cabinets containing about 110,000 battery cells, utilizing lithium iron phosphate technology to ensure safety and long service life.
The storage system is equipped with new medium-voltage switchgear, serving as the interface with the grid to enable flexible electricity injection and withdrawal. The Marbach site is already integrated into EnBW's system planning; in addition to the new storage facility, the company has been operating a grid stabilization facility at the location since last year, focused on system stability rather than commercial power generation.
The Marbach project is a key component of EnBW's storage expansion strategy. The company currently operates more than 20 battery storage systems with a total capacity exceeding 100 MWh, with approximately 1,800 MWh of projects in development or under construction. New solar parks are commonly combined with battery storage to enhance renewable energy integration capabilities. EnBW also plans to build another large-scale battery storage facility in Philippsburg.
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